B-type star · blue-white star
Upsilon Cyg
Upsilon Cyg is a blue-white star in the constellation Cygnus 642 ly from Earth. Its surface is about 11,624 K, about 2.0 times the Sun's surface temperature, and it shines at 581× the Sun's brightness. At magnitude 4.4 it is bright enough to see with the naked eye; the light you see left it 642 years ago.
Also catalogued as HR 8146 · HD 202904 · HIP 105138
11,624 K
temperature
4.41
apparent magnitude
581× ☉
luminosity vs Sun
B2Vne
spectral type
Distance & comparison with our Sun
642 years
at light speed from Earth
2.01×
as hot as the Sun
581×
the Sun's light output
-2.06
absolute magnitude
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VISIBLE TO THE NAKED EYE
Star data from the HYG database v4.2 (Astronexus, CC BY-SA 4.0). Temperature and colour computed by gravityfinder from the B-V colour index; the illustration is generated from that temperature, not a photograph.